A random sample of 20 acres gave a mean yield of wheat equal to 41.6 bushels per acre with a standard deviation of 3 bushels Assuming that the yield of wheat per acre is normally distributed construct...

 A random sample of 20 acres gave a mean yield of wheat equal to 41.6 bushels per acre with a standard deviation of 3 bushels Assuming that the yield of wheat per acre is normally distributed construct a 90% confidence interval for the population mean mu